khi nguoi dung chon 1 link bai hoc, chang han bai 1, thi trang nay hien thi bai hoc do
duoc chia lam 2 phan
phan tren la danh sach cac phan
phan duoi la noi dung tung phan khi click vao link tuong ung

	BAI HOC 1
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phan 1
phan 2
phan 3

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noi dung phan 1 tuong ung khi clcik vao phan 1
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